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This patch modifies the implementation of Functional_Base to damp the cost of its subprograms at runtime in specific cases. Instead of copying the entire underlying array to create a new container, containers can share the same Array_Base attribute. Performance on common use cases of formal and functional containers is improved with this patch. 2019-08-14 Joffrey Huguet <huguet@adacore.com> gcc/ada/ * libgnat/a-cofuba.ads: Add a Length attribute to type Container. Add a type Array_Base which replaces the previous Elements attribute of Container. (Content_Init): New subprogram. It is used to initialize the Base attribute of Container. * libgnat/a-cofuba.adb (Resize): New subprogram. It is used to resize the underlying array of a container if necessary. (=, <=, Find, Get, Intersection, Length, Num_Overlaps, Set, Union): Update to match changes in type declarations. (Add): Modify body to damp the time and space cost in a specific case. (Content_Init): New subprogram. It is used to initialize the Base attribute of Container. (Remove): Modify body to damp the time and space cost in a specific case. From-SVN: r274474
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